由于卸扣会使钻具产生弯曲力，因此，钻具接头必须尽可能低些坐在卡瓦上。
Since a bending force is exerted on the pipe during break out, the tool joint connection must be set in the slips as low as possible.
采用有限元法对低匹配条件下x 80钢级管线钢焊接接头的变形能力进行了研究。
The deformability of under-matched X80 grade pipeline steel welding joint was studied through Finite Element Method.
钻杆接头的各种纵向开裂属于低应力脆性断裂。
Longitudinal crack of drill pipe box joint is brittle fracture at low stress.
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